When matching glasses, the deviation between the horizontal distance of the optical center of the old glasses and the distance between the pupils should be measured first, and the corresponding prism degree at the pupil should be calculated as a reference for matching the new cheapest eyeglasses.

On the other hand, using eye muscles to regulate myopia can easily cause visual fatigue and deepen the degree of development. The use of transition optical distance is not suitable for older people, and it is best to maintain the original state to avoid discomfort and other problems.

The inclination of the mirror frame legs refers to the angle between the normal of the mirror body plane and the legs of the mirror. Due to many non-standard glass frames and the deformation of glass frames during the wearing process, the size of the tilt has an impact on visual habits.

Because the position of the discountglasses legs is mostly connected to the upper half of the glasses frame, and due to the gravity of the glasses themselves, there is a deviation in the optical center position of the glasses when wearing. One solution for this situation is to make the patient adapt as much as possible, and another approach is to adjust the leg inclination appropriately when the patient cannot adapt so that it is close to the original mirror.

For patients with higher degrees and a longer history of wearing glasses, the asymmetry of the optical center of the old mirror will hinder the effectiveness of wearing the new mirror. When fitting glasses, the optical center symmetry of the old glasses should be measured, and the influence of the corresponding prism degree at the pupil should be calculated based on their refractive power. The glasses can be adjusted according to the patient's old glasses condition.